net/iavf: fix VLAN offload strip flag

[ upstream commit e25c7ed114b296ddaa583427824acc30bcf9c85d ]

For i40e kernel driver which only supports vlan(v1) VIRTCHNL OP,
it will set strip on when setting filter on but dpdk side will not
change strip flag. To be consistent with dpdk side, disable strip
again.

Fixes: cb25d43 ("net/avf: enable MAC VLAN and promisc ops")

Signed-off-by: Wenjing Qiao <wenjing.qiao@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

drivers/net/iavf/iavf_ethdev.c

@@ -1013,6 +1013,7 @@ iavf_dev_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
 	struct iavf_adapter *adapter =
 		IAVF_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
 	struct iavf_info *vf = IAVF_DEV_PRIVATE_TO_VF(adapter);
+	struct rte_eth_conf *dev_conf = &dev->data->dev_conf;
 	int err;
 
 	if (!(vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_VLAN))
@@ -1021,6 +1022,23 @@ iavf_dev_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
 	err = iavf_add_del_vlan(adapter, vlan_id, on);
 	if (err)
 		return -EIO;
+
+	/* For i40e kernel driver which only supports vlan(v1) VIRTCHNL OP,
+	 * it will set strip on when setting filter on but dpdk side will not
+	 * change strip flag. To be consistent with dpdk side, disable strip
+	 * again.
+	 *
+	 * For i40e kernel driver which supports vlan v2, dpdk will invoke vlan v2
+	 * related function, so it won't go through here.
+	 */
+	if (adapter->hw.mac.type == IAVF_MAC_XL710 ||
+	    adapter->hw.mac.type == IAVF_MAC_X722_VF) {
+		if (on && !(dev_conf->rxmode.offloads & DEV_RX_OFFLOAD_VLAN_STRIP)) {
+			err = iavf_disable_vlan_strip(adapter);
+			if (err)
+				return -EIO;
+		}
+	}
 	return 0;
 }